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Olegator [25]
3 years ago
10

Rectangular Washington County measures 15.9 miles by 9.1 miles. What is the county's area?

Mathematics
2 answers:
____ [38]3 years ago
7 0
Formula for Area= L x W (length x Width). 15.9 X 9.1= 144.69
aalyn [17]3 years ago
6 0

Answer:

Step-by-step explanation:

What is the answer please

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I need help with adding complex numbers
Usimov [2.4K]

For example:

Find: (3-i)+(2+3i) by graphing

Step 1: Graph 3-i and 2+3i on the complex plane. Connect each of these numbers to the origin with a line segment.


4 0
3 years ago
A researcher is concerned about the impact of students working while they are enrolled in classes, and she likes to know if stud
8_murik_8 [283]

Answer:

(a) Point estimate = 7.10

(b) The critical value is 1.960

(c) Margin of error = 0.800

(d) Confidence Interval = (6.3, 7.9)

(e) We are 90% confident that the average number of hours worked by the students is between 6.3 and 7.9

Step-by-step explanation:

Given

\bar x = 7.10 -- sample mean

\sigma=5 --- sample standard deviation

n = 150 --- samples

Solving (a): The point estimate

The sample mean can be used as the point estimate.

Hence, the point estimate is 7.10

Solving (b): The critical value

We have:

CI = 90\% --- the confidence interval

Calculate the \alpha level

\alpha = 1 - CI

\alpha = 1 - 90\%

\alpha = 1 - 0.90

\alpha = 0.10

Divide by 2

\frac{\alpha}{2} = 0.10/2

\frac{\alpha}{2} = 0.05

Subtract from 1

1 - \frac{\alpha}{2} = 1 - 0.05

1 - \frac{\alpha}{2} = 0.95

From the z table. the critical value for 1 - \frac{\alpha}{2} = 0.95 is:

z = 1.960

Solving (c): Margin of error

This is calculated as:

E = z * \frac{\sigma}{\sqrt n}

E = 1.960 * \frac{5}{\sqrt {150}}

E = 1.960 * \frac{5}{12.25}

E =  \frac{1.960 *5}{12.25}

E =  \frac{9.80}{12.25}

E =  0.800

Solving (d): The confidence interval

This is calculated as:

CI = (\bar x - E, \bar x + E)

CI = (7.10 - 0.800, 7.10 + 0.800)

CI = (6.3, 7.9)

Solving (d): The conclusion

We are 90% confident that the average number of hours worked by the students is between 6.3 and 7.9

6 0
2 years ago
a bookstore owner asks every fifth customer on a single day if he or she owns a e-book reader . select yes or no for each questi
Masteriza [31]
Yes, it is random because it isn't convenient for him.
6 0
3 years ago
Miguel rented a truck for one day. There was a base fee of $20.95, and there was an additional charge of 83 cents for each mile
goblinko [34]

Answer:

254 miles

Step-by-step explanation:

7 0
2 years ago
Daca a/3=7/10 calculati 100a
likoan [24]
A/3=7/10
21=10a
a=2.1
100a=100*2.1=210
6 0
3 years ago
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